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Backend Software Engineer - Custody (Remote - Europe) at Jobgether. This position is posted by Jobgether on behalf of a partner company. We are currently looking for a Backend Software Engineer - Custody in Europe.. As a Backend Software Engineer specializing in custody solutions, you will play a key role in designing, developing, and maintaining secure, high-performance applications for the digital assets industry. You will work with cutting-edge blockchain technologies, cryptography, and specialized hardware to build scalable, reliable services that safeguard digital assets. This fully remote role offers the chance to collaborate with an international team of experts in Rust, C++, Go, and on-chain systems, contributing directly to next-generation custody solutions. You will be responsible for implementing robust architectures, integrating with multiple blockchain networks, and improving the security and efficiency of critical systems. The position provides the opportunity to influence the technical strategy, mentor colleagues, and stay at the forefront of blockchain innovation in a fast-paced, evolving environment.. . Accountabilities. Design, implement, and maintain low-latency, high-availability backend systems for custody services.. Integrate existing systems with new blockchain networks and crypto protocols.. Develop secure applications and data protection mechanisms, including hardware security module (HSM) integrations.. Build highly scalable services capable of handling large volumes of transactions efficiently.. Write reusable, testable, and efficient code, contributing to both new features and maintenance of existing crypto services.. Collaborate with cross-functional teams of engineers, cryptographers, and hardware specialists to deliver innovative custody solutions.. . 5–10 years of experience in backend software development.. Strong proficiency in Rust, C++, or Go.. Hands-on experience with blockchain daemons (e.g., Bitcoin, Litecoin) or similar crypto software.. Solid foundation in cryptographic concepts and secure system design.. Knowledge of Docker, Kubernetes, GNU/Linux, and asynchronous programming patterns.. Experience with distributed systems and messaging platforms such as Kafka.. Understanding of authentication, authorization, and security compliance practices.. Ability to design scalable, maintainable, and efficient applications.. Nice-to-Have Qualifications:. Senior leadership or mentoring experience.. Experience with embedded systems and constrained environment algorithms.. Hands-on knowledge of custodial cryptographic techniques.. Proven track record in developing secure crypto services.. . Company Location: France.